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Design and evaluation of 2.3 Tb/s (23 ch. × 100 Gb/s) multi-carrier WDM optical transmission systems

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Abstract

Multilevel phase modulation formats with coherent detection enable a new generation of high speed optical transport platform. We demonstrate 23 × 100 Gbps (2.3 Tb/s) WDM Optical systems employing multicarrier generation concept. Three lasers are used to generate 23 sub-carriers using multicarrier generator at transmitter section. Each sub-carrier transmits at a transmission rate of 100 Gbps using polarization division multiplexed quadrature phase shift keying (PDM-QPSK) modulation format with spacing of 25 GHz between sub carriers. The analysis is carried out for 23 × 100 Gb/s (2.3 Tb/s) PDM-QPSK WDM optical systems with ultra large area fiber (ULAF), standard single mode fiber (SSMF) and large effective area fiber (LEAF) at transmission reach from 600 to 5000 km. Coherent detection with DSP is used for all the systems at receiving end. Systems are verified with parameters like symbol error rate, error vector magnitude (EVM) and Q-factor using analytical and simulation results. Improvement of 1.66 dB to 3.21 dB and 2.08 dB to 4.63 dB is noted in Q-factor for system with ULAF in comparison with system using SSMF and LEAF respectively over 600 km to 5000 km transmission reach. EVM values are found 2.24% to 2.68% and 2.68% to 12.43% lower in system with ULAF than system with SSMF and LEAF respectively. Log of estimated symbol error is observed less for system with ULAF than systems with SSMF and LEAF fibers, respectively, at transmission distance of 5000 km. The results clearly show that WDM optical system with ULAF fiber gives better performance.

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Authors and Affiliations

  1. Information and Communication Technology Department, Adani Institute of Infrastructure Engineering, Ahmedabad, India

    Rohit B. Patel

  2. Electronics and Communication Engineering Department, Institute of Technology, Nirma University, S.G. Highway, Ahmedabad, India

    Dilip Kumar Kothari

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  1. Rohit B. Patel
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  2. Dilip Kumar Kothari
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Contributions

In this paper, we show multi-carrier WDM optical systems design using PDM-QPSK modulation format with three different fibers like ULAF, SSMF and LEAF. This is significant because recently high spectral efficient WDM optical systems using multilevel phase modulation are in demand for long distance communication. Design and evaluation of multi-carrier WDM optical communication systems with polarization division multiplexed quadrature phase shift keying (PDM-QPSK) modulation format is being addressed in this in this paper. Recently, researchers are working with high spectral efficient modulation formats like (PDM-QPSK) with high spectral efficiency for long reach WDM optical communication. Fiber nonlinearity and dispersion are major issues to restrict the transmission reach at high spectral efficiency. We have used the concept of multi-carrier generation at transmitting end for WDM optical systems to reduce the channel spacing (25 GHz) and increase the spectral efficiency up to 4 b/s/Hz. Data rate for each channel is kept 100 Gb/s. Fiber nonlinearity and dispersion are compensated at receiving end using DSP. WDM optical systems are evaluated for three different fibers like ultra large area fiber (ULAF), standard single mode fiber (SSMF) and large effective area fiber (LEAF) for long reach up to 5000 km.

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Correspondence to Rohit B. Patel.

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Patel, R.B., Kothari, D.K. Design and evaluation of 2.3 Tb/s (23 ch. × 100 Gb/s) multi-carrier WDM optical transmission systems. Opt Quant Electron 53, 186 (2021). https://doi.org/10.1007/s11082-021-02826-x

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